The valve opening closing would be similar... If thats all the differences between the two cams is just the timing mark, then its unusually for the $10 price difference between the two... the 200Ti front cam is from the left side cam of the odd fire 182 twin, that cylinder's valve timing / cam profile is the same as a single cylinder... the 200Ti rear cam could very well be just the timing mark reference index, but I believe there is a difference in valve opening closing timing by a few degrees between the two cylinders... Degree the front valve timing with the cam set on its timing mark in reference to TDC, and then rotate the crank counterclockwise 360 degrees (prop rotation) and see if you can dial in (degree) the rear cam valve open closing in degrees and disregard the cam timing mark, if you can't then the cam profile, valve opening closing, duration and overlap will be different between the two cylinders.